ilah has a string, , of lowercase English letters that she repeated infinitely many times. Given an integer, ,
function repeatedString($s, $n) {
// check the number of occurrences of letter 'a' on given string $s
$a_occurrences_in_s = substr_count($s, 'a');
// check how many occurrences of string $s belongs to an repeated string $s of length of $n
$s_occurrences_qty = floor($n / strlen($s));
// get the $s occurrences left
$s_occurrences_left = $n - ($s_occurrences_qty * strlen($s));
// left string
$s_left = substr($s, 0, $s_occurrences_left);
// 'a' occurrences in left string
$a_occurrences_in_s_left = substr_count($s_left, 'a');
// occurrencies of 'a' on the entire repeated string of $s with a length of $n
return ($a_occurrences_in_s * $s_occurrences_qty) + $a_occurrences_in_s_left;
}